i think your grand strategy (wharf big money) is correct, despite the scrying pool helpers (lighthouse, outpost, salvager, peddler). i don't think you want a salvager at all, and you definitely don't want a hoard till you are sure that when you draw it you will buy a province.
maybe once his deck threatens to catch up, buy salvagers and peddlers with extra buys (worst case scenario just burn a province). until then, i'd go three wharves, one bank if you get the wharves early enough, one hoard, green, in that order, buying silver whenever i couldn't afford one of these options. (and agonizing between lighthouse and nothing with an unlikely two). a fourth wharf is ok later if your deck starts to "clog" from the golds that hoard gives you.